Your LOCALHOST for hostname is very odd. Are you not using DNS? It has been like this for a year now with no MAJOR issues, and all other (3) databases residing on this server also uses "localhost" is applying logs good.

Did the logs transport, but not apply only? Yes I can see the archive log 4054, 4055, etc.... at the standby server.

I would check note 1221163.1 ( How to resolve MRP stuck issues on a physical standby database? [ID 1221163.1] )